Example from class awhile back

 
/** 
 *  
 */ 
package example05; 
 
import java.util.Scanner; 
 
/** 
 * @author pajensen 
 * 
 */ 
public class MethodDemo 
{ 
 
    /** 
     * @param args 
     */ 
    public static void main (String[] args) 
    { 
        Scanner in = new Scanner (System.in); 
         
        System.out.println ("Enter an east coordinate: "); 
        int e1 = in.nextInt(); 
        System.out.println ("Enter a south coordinate: "); 
        int s1 = in.nextInt(); 
        System.out.println ("Enter another east coordinate: "); 
        int e2 = in.nextInt(); 
        System.out.println ("Enter another south coordinate: "); 
        int s2 = in.nextInt(); 
         
        double result; 
        result = MethodDemo.distance(e1, s1, e2, s2); 
        result /= 700; 
        
        System.out.println ("As the crow flies, the coordinates are " + result + " miles apart."); 
    } 
     
    /** 
     * This method computes the Cartesian distance between two 
     * points. 
     *  
     * @param x1  the first x coordinate 
     * @param y1 
     * @param x2 
     * @param y2 
     * @return 
     */ 
    public static double distance (double x1, double y1, double x2, double y2) 
    { 
        double deltaX, deltaY; 
         
        deltaX = x1 - x2; 
        deltaY = y1 - y2; 
         
        double dist; 
         
        dist = Math.sqrt(deltaX * deltaX + deltaY * deltaY); 
         
        return dist; 
    } 
 
} 

LateFine Method.java

	/**
	 * This method computes an overdue fine for a number of books.
	 * Given an integer number of books and late days, the
	 * fine is computed as follows:
	 * 
	 * $0.15 per book per day for the first week
	 * $0.25 per book for any additional late days
	 * 
	 * No fine will exceed $25.  If the computed fine exceeds $25, it is
	 * reduced to $25.
	 * 
	 * It is assumed that the inputs are non-negative.
	 * 
	 * @param bookCount the number of books that are late
	 * @param daysLate the total number of days late
	 * 
	 * @return		the total fine (as a double)
	 */
	public static double computeOverdueFine (int bookCount, int daysLate) {
		int firstWeek = 0;
		int afterWeek = 0;
		double fine = 0.0;
		
		if(daysLate > 7) {
			afterWeek = (daysLate - 7);
			firstWeek = 7;
		}
		else {
			firstWeek = daysLate;
		}
		
		fine += (firstWeek * bookCount) * 0.15;
		fine += (afterWeek * bookCount) * 0.20;
		
		if(fine > 25) {
			return 25.00d;
		}
		
		return fine;
	}